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      反转单链表
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        <h5 id="反转单链表"><a href="#反转单链表" class="headerlink" title="反转单链表"></a>反转单链表</h5><ul>
<li>递归</li>
</ul>
<p>1-&gt;2-&gt;3-&gt;4输出4-&gt;3-&gt;2-&gt;1</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="comment">// 定义Node</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Node</span> </span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">int</span> value;</span><br><span class="line">    <span class="keyword">public</span> Node next;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Node</span><span class="params">(<span class="keyword">int</span> data)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.value = data;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> Node <span class="title">reverse</span><span class="params">(Node head)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (head == <span class="keyword">null</span> || head.next == <span class="keyword">null</span>)</span><br><span class="line">        <span class="keyword">return</span> head;</span><br><span class="line">        </span><br><span class="line">    Node temp = head.next;</span><br><span class="line">    Node newHead = reverse(head.next);</span><br><span class="line">    temp.next = head;</span><br><span class="line">    head.next = <span class="keyword">null</span>;</span><br><span class="line">    <span class="keyword">return</span> newHead;</span><br><span class="line">    </span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">程序到达Node newHead = reverse(head.next);时进入递归</span><br><span class="line">我们假设此时递归到了<span class="number">3</span>结点，此时head=<span class="number">3</span>结点，temp=<span class="number">3</span>结点.next(实际上是<span class="number">4</span>结点)</span><br><span class="line">执行Node newHead = reverse(head.next);传入的head.next是<span class="number">4</span>结点，返回的newHead是<span class="number">4</span>结点。</span><br><span class="line">接下来就是弹栈过程了</span><br><span class="line"></span><br><span class="line">程序继续执行 temp.next = head就相当于<span class="number">4</span>-&gt;<span class="number">3</span></span><br><span class="line">head.next = <span class="keyword">null</span> 即把 <span class="number">3</span>结点指向<span class="number">4</span>结点的指针断掉。</span><br><span class="line">返回新链表的头结点newHead</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">注意：当retuen后，系统会恢复<span class="number">2</span>结点压栈时的现场，此时的head=<span class="number">2</span>结点；temp=<span class="number">2</span>结点.next(<span class="number">3</span>结点)，再进行上述的操作。最后完成整个链表的翻转。</span><br></pre></td></tr></table></figure>
<ul>
<li>遍历</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Node <span class="title">reverseList</span><span class="params">(Node node)</span> </span>&#123;</span><br><span class="line">    Node pre = <span class="keyword">null</span>;</span><br><span class="line">    Node next = <span class="keyword">null</span>;</span><br><span class="line">    <span class="keyword">while</span> (node != <span class="keyword">null</span>) &#123;</span><br><span class="line">        next = node.next;</span><br><span class="line">        node.next = pre;</span><br><span class="line">        pre = node;</span><br><span class="line">        node = next;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> pre;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">准备两个空结点 pre用来保存先前结点、next用来做临时变量</span><br><span class="line">在头结点node遍历的时候此时为<span class="number">1</span>结点</span><br><span class="line"></span><br><span class="line">next = <span class="number">1</span>结点.next(<span class="number">2</span>结点)</span><br><span class="line"><span class="number">1</span>结点.next=pre(<span class="keyword">null</span>)</span><br><span class="line">pre = <span class="number">1</span>结点</span><br><span class="line">node = <span class="number">2</span>结点</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">进行下一次循环node=<span class="number">2</span>结点</span><br><span class="line"></span><br><span class="line">next = <span class="number">2</span>结点.next(<span class="number">3</span>结点)</span><br><span class="line"><span class="number">2</span>结点.next=pre(<span class="number">1</span>结点)=&gt;即完成<span class="number">2</span>-&gt;<span class="number">1</span></span><br><span class="line">pre = <span class="number">2</span>结点</span><br><span class="line">node = <span class="number">3</span>结点</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">进行循环...</span><br></pre></td></tr></table></figure>
      
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